From Longman Dictionary of Contemporary Englishcoincoin1 /kɔɪn/ ●●● S3 noun 1 
[countable]MONEY a piece of metal, usually flat and round, that is used as money → bill, note► see thesaurus at money2 → toss/flip a coin3 → the other/opposite side of the coin4 → two sides of the same coin5 [uncountable]MONEY money in the form of metal coins
[countable]MONEY a piece of metal, usually flat and round, that is used as money → bill, note► see thesaurus at money2 → toss/flip a coin3 → the other/opposite side of the coin4 → two sides of the same coin5 [uncountable]MONEY money in the form of metal coinsExamples from the Corpus
coin• The word "yuppie" is a coinage of the 1960s which found a new fame in the 1980s.• The depictions on paper money and coins reinforce national icons and symbols.• At the last moment the U.K. managed to push through an optional exemption of archaeological goods such as coins.• The range of denominations A second way of looking at coins is to examine the denominations in which they were made.• I used to collect coins when I was a kid.• A couple of coins landed on the frosty road.• Impressed by their studiousness, we carefully counted out some coins, making sure each boy got the same amount.• The driver counts the coins into his tin.coincoin2 verb [transitive] 1 INVENTto invent a new word or expression, especially one that many people start to use The word ‘aromatherapy’ was coined in the 1920s.2 → to coin a phrase3 → coin money/coin it (in)4 PECto make pieces of money from metal→ See Verb tableExamples from the Corpus
coin• And the newcomers never stopped coining.• He was going to have fun if it killed him, to coin a phrase.• But in later years I heard it called the Perilous Chair, and I think the name was coined after that day.• The term "black hole" was coined in 1969 by the American scientist John Wheeler.• I coined it but my good friend Will Shakespeare seized it for himself.• In a school gymnasium full of caucus-goers in Des Moines, Dole inadvertently coined the best phrase of this perplexing campaign.• A Polish refugee coined the term "genocide" to describe attempts to kill an entire group of people.• Freed was the disk jockey who coined the term "rock 'n' roll."From Longman Business Dictionarycoincoin1 /kɔɪn/ noun1[countable] a piece of metal, usually flat and round, that is used as moneySince the introduction of the £1 coin, the smallest English note is £5.2[uncountable] money in the form of metal coinsThey found £1,000 in coin.coincoin2 verb [transitive]1to make pieces of money from metal2British English informal coin money/coin it in to earn a lot of money very quicklyTop footballers have been coining it in for years.→ See Verb tableOrigin coin1 (1300-1400) Old French “three-sided piece, corner”, from Latin cuneus; → CUNEIFORM 